If you want a mobile app to caption your phone calls, ClearCaptions is a good choice. The service offers captions in near real time right on your phone, a boon for people with hearing loss who want to communicate more easily. It works on phones and home phones, and is free for eligible US residents under the Americans with Disabilities Act (ADA).
Another interesting example is AIPhone, which offers live translation and transcription services to help people communicate across languages. Although geared for international calls, it also offers live transcription so you can capture important details from phone calls. It's a good option for anyone who wants to tap into the global market without language barriers.
For a more general communication tool, EzDubs translates and dubs languages for voice and video communications. It offers live phone call translation, voice message dubbing and video dubbing, so it's a good option for individuals and businesses that want to communicate with international contacts. It's available on iOS and Android devices.